For starters it is always good to play only one table. If you are total beginner that should be even a rule
Maybe it is even better to start with FR, but don't quote me on that

Beginners tends to make more mistakes on shorthanded, especially if you have to make two, or even more decisions at one time.
Just imagine when three tables are blinking.
Panic, panic, panic...

I, for example, am still playing "only" 2 shorthanded table at once. I can be more focus this way, am more aware of other player moves. Yeah, maybe I don't get as much $/hour as others, but this is only way I can play my A-game.